Introduction
In cleanroom facilities, the transfer of materials is one of the biggest sources of contamination risk. A 90-degree pass box—also called a corner pass-through chamber—is designed to optimize both workflow and contamination prevention. By enabling material transfer around corners, this specialized pass box not only saves space but also enhances safety and efficiency in industries like pharmaceuticals, semiconductors, food, and biotechnology.
1. What is a 90° Pass Box?
A 90° pass box is a transfer chamber with doors positioned at right angles. Unlike straight-through designs, it connects two cleanroom zones that meet at a corner, making it highly suitable for complex facility layouts.
Key characteristics include:
L-shaped door configuration.
Electronic interlock system that prevents both doors from opening at once.
Flush stainless-steel design for easy cleaning.
Options for HEPA filtration, UV disinfection, and refrigeration depending on application.
2. Workflow Advantages
2.1 Space Optimization
Many cleanrooms face layout limitations. A 90° pass box allows more efficient use of available space by fitting into corners without altering the facility’s main structure.
2.2 Reduced Foot Traffic
Personnel movement is one of the leading causes of contamination. By transferring materials via pass boxes instead of people carrying them, cleanrooms can significantly cut down cross-traffic and contamination risk.
2.3 Faster Material Flow
Instead of rerouting materials through multiple zones, corner pass boxes create a direct link between adjacent rooms, improving speed and productivity.
3. Contamination Control Benefits
Electronic Interlock – Ensures one door is always closed, preserving pressure differentials.
HEPA/ULPA Filtration – Maintains ISO 14644 standards by controlling airborne particles inside the chamber.
UV Sterilization – Reduces microbial load for sterile manufacturing applications.
Seamless Design – Smooth, lipless interiors minimize particle accumulation and ease cleaning.
4. Industry Applications
Pharmaceuticals & Biotech – Transfer APIs, sterile drugs, or lab samples safely.
Semiconductors & Electronics – Protect wafers and chips from microscopic particles.
Food & Cosmetics – Support hygiene compliance by preventing external contamination.
Hospitals & Labs – Transfer surgical tools, test samples, or sterile materials.
5. Why Choose a 90° Pass Box?
| Feature | Advantage for Operations |
|---|---|
| 90° Layout | Perfect for corner installations, saves space |
| Interlock System | Maintains cleanroom integrity |
| Optional HEPA & UV | Customizable for high-contamination control |
| Stainless Steel Build | Durable and easy to sanitize |
| Faster Workflow | Direct transfer between adjacent clean zones |
FAQ – 90° Pass Box
1. What is the main difference between a 90° and straight pass box?
A 90° pass box connects rooms at a corner, while a straight pass box connects rooms on opposite walls.
2. Does it require more maintenance?
No. With stainless-steel design and HEPA filters, maintenance is simple and predictable.
3. Can 90° pass boxes be customized?
Yes. Options include UV sterilization, HEPA filtration, and refrigeration.
4. Are they GMP-compliant?
Yes. They support GMP, ISO 14644, and USP cleanroom standards.
5. How do they save energy?
By reducing personnel movement and maintaining pressure balance, they lower HVAC loads.
6. Can they be installed without disrupting cleanroom operations?
Flush-mount designs allow fast installation with minimal downtime.
7. Are they suitable for high-grade cleanrooms (ISO 5–7)?
Yes. With HEPA/ULPA filters, they are ideal for high-grade environments.
8. What industries benefit most from 90° pass boxes?
Pharmaceutical, biotech, semiconductor, food, cosmetics, and hospital facilities.
9. Do they come in multi-door configurations?
Yes. T-shape and X-shape designs are available for complex cleanroom layouts.
10. Can refrigeration be added?
Yes. For pharmaceuticals and biological samples, refrigerated pass boxes maintain low temperatures during transfer.
Conclusion
A 90-degree pass box is more than a corner transfer chamber—it is a strategic solution that enhances workflow, reduces contamination, and saves energy. With smart interlocks, HEPA filtration, and optional UV or refrigeration, it provides unmatched flexibility for modern cleanroom operations.
Vietnam Cleanroom (VCR)
📍 Hanoi Office: 9/675 Lạc Long Quân, Tây Hồ District, Hanoi, Vietnam
📍 HCM Office: 15/42 Phan Huy Ích, Ward 15, Tân Bình District, Ho Chi Minh City
🏭 Factory: An Tường Commune, Vĩnh Tường District, Vĩnh Phúc Province
📞 Hotlines: +84 90 123 9008 | +84 90 123 7008 | +84 90 444 7008 | +84 90 126 6008
📧 Email: info@vietnamcleanroom.com
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